Replaceable shoe for scraper bowl edges



May 7, 1963 H. F. GILBERTSON 3,088,232

REPLACEABLE SHOE FOR SCRAPER BOWL EDGES Filed June 15, 1962 2Sheets-Sheet 1 'INVENTOR. HERMAN F. GILBERTSON May 7, 1963 H. F.GILBERTSON I REPLACEABLE SHOE .FOR SCRAPER BOWL EDGES 2 Sheets-Shoat 2Filed June '15, 1962 INVENTOR. HERMAN F. Gnezmsou I Pmvs.

United States Patent 3,088,232 REPLACEABLE SHGE FOR SCRAPER BGWL EDGESHerman F. Gilbertson, N. 4920 Rebecca, Spokane, Wash. Filed June 15,1962, Ser. No. 202,879 4 Claims. (Cl. 37-141) This invention relates toreplaceable shoes for scraper bowl edges of the type utilized onearth-moving implements and is particularly designed for use withearthmoving scrapers having a forward cutting blade bounded by verticalcutting edges.

It is customary in the earth-moving implement field to provide sidecutting edges on scrapers to define a sharp boundary line where materialhas been removed. In many machines the lower corner is integral with thelarger sidewall on which it is formed. This forward corner is vulnerableto excessive wear due to rocks and hard earth surfaces. Replacement ofthese corners is necessary periodically and requires a considerableamount of time and skill where the corners must necessarily be welded.Various replaceable bits or covers have been offered for use on thesecorners. However, to date, each of these corners has utilizedconventional mounting means such as bolts, which necessarily requireprojecting heads which are subject to damage and shearing actions.

The present invention contemplates a replaceable shoe for the vulnerablecorners of a scraper which may be mounted on the sidewalls without theuse of a bolt or other projecting mounting apparatus.

It is a first object of this invention to provide with a speciallyconstructed corner structure a replaceable shoe which may be readilyapplied to the scraper or removed without the requirement of specialskills or tools. The present invention contemplates a shoe which is heldin place by complementary surfaces on the mating parts and by a simpleknockout pin.

Another object of this invention is to provide such a shoe with noprojecting surfaces which are subject to damage or exceptional wear. Theshoe in this instance comprises entirely smooth outer, surfaces whenmounted on the sidewalls of the scraper.

One further object of this invention is to provide a replaceable shoewhich covers the mating surfaces of the shoe and sidewall so that themachined areas are completely protected in use from damage due to thematerial being Worked upon.

These and further objects will be evident from a study of the followingdisclosure taken in conjunction with the accompanying drawings whichillustrate one prefeired form of this invention. It is to be understoodthat this form of the invention is exemplary and is not intended tocompletely limit or restrict my invention except as the invention isdefined in the claims following this detailed description.

FIGURE 1 is a perspective view of an earth-moving scraper showing therelationship of the instant shoe to the scraping surfaces;

FIGURE 2 is a fragmentary side view of the cutting corner on theearth-moving scraper showing the assembly of the instant shoe, the finalposition of the shoe being illustrated in dashed lines;

FIGURE 3 is an end view of the assembled shoe as seen along line 3-3 inFIGURE 2;

FIGURE 4 is a fragmentary perspective view of the assembled shoe;

FIGURE 5 is a top view of the replaceable portion of the shoe as seenalong line 55 in FIGURE 2;

FIGURE 6 is a sectional view through the assembled shoe as seen alongline '6-6 in FIGURE 2; and

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FIGURE 7 is a sectional view through the assembled shoe as illustratedalong line 77 in FIGURE 2.

In FIGURE 1 of the accompanying drawings an earthmoving scraper of thetype with which the present invention may be utilized is illustrated asincluding a bowl or body 10 which is pivotally supported adjacent itsrear end by a pair of wheels 11. The scraper is supported at its forwardend on a tractor (not shown) by a conventional draft connection 12. Thebowl 10 is provided with a blade 13 adjacent its forward portion to aidin the collection of earth in the bowl 1% in the normal manner. Theblade 13 is replaceably mounted on the body of the bowl 10 in theconventional manner.

The bowl is provided with a front gate or apron 14 which may be utilizedto prevent the spilling of earth from bowl 10 during transportation andwhich also is capable of regulating the amount of earth that can passinto the bowl 10 during loading operations utilizing the blade 13.

The normal operating procedure when using such a scraper is to lower thebowl 10 about the axis of its wheels 11 until the blade 13 engages theground to be moved. The tractor then draws the bowl 10 forward, andearth engaged by the blade 13 will be deposited in the bowl 10 fortransportation.

The side boundaries of the blade 13 are customarily formed by shortcutting bits formed at the lower front corners of the sidewall 15 ofbowl 10. Since the corners are vulnerable to rocks and other materialswhich eifect injury to the corners, the present invention is concernedwith a replaceable shoe to provide a long wearing and easily repairablesurface at this wear point. The sidewalls 15 each terminate in anupright front edge 16 and a lower edge 19. In order to practice theinstant invention, it is necessary to cut away a rectangular portion ofthe walls 15 at their lower front corners to provide a recessed loweredge 17. The recessed area is then filled by a plate 27 which isintegrally secured to the sidewall 15 by common welding procedures. Thisplate 27 is also welded to the permanent portion of the blade 13 andbecomes a part of the bowl 10. The plate 27 is provided with a forwardlyand downwardly directed projection 18 which is of reduced thickness.This projection 18 is located on the front edge 16 of the wall 15. Alongthe lower edge 17 are formed a pair of upwardly and rearwardly directedgrooves 20 cut in opposed relationship on each side surface of the wall15. The grooves 20 are parallel to the blade 13 and parallel to theprojection 18.

The replaceable portion of the invention comprises an L-shaped shoe 21of a thickness somewhat greater than the thickness of the sidewall 15upon which it is to be mounted. The inside corner of the shoe 21 isprovided with two intersecting edges 22 and 23 which are formedcomplementary to the edges 16 and 17 respectively of the plate 27. Thefirst edge 22 is provided with a recess 24 complementary to theprojection 18 and adapted to receive the projection 18 therein. Alongthe top of the edge 23 are two raised ribs 25 adapted to slidably engagethe grooves 29 on the wall 15.

It should be apparent from the drawings and from the above descriptionthat the shoe 21 may readily be mated with the modified sidewall 15 byslipping the projection 18 into the recess 24 while engaging the grooves20 by the ribs 25. This assembly is .best seen in FIGURE 2. In order tolock the shoe to the wall 15 a coaxial set of apertures 28, 2.8 is cutthrough both the plate 27 and the shoe 21 and a locking pin 26 is fittedtherein after positioning the shoe 21. The locking pin 26 is preferablya tight fit so that it will remain in place until knocked out by use ofa punch or similar implement.

Thus I have described a very simple replaceable shoe which can bereadily adapted to any vertical cutting edge on heavy equipment such asan earth-moving scraper. The practice of this invention does not in anyway modify the normal earth-moving operations but insures that theearth-mover may always be provided with a Well-conditioned cutting edgeso as to define its bite. The addition of the removable shoe provides nooutwardly extended projections which are subject to damage during use ofthe scraper. No bolt heads or nuts are provided in vulnerable positions,and the machined surfaces of the ribs 25, grooves '20 and projection 18are entirely enclosedand not subject to damage. The shoe 21 may bereadily replaced at the job site by simply knocking out the pin 26 andslipping a new shoe 21 onto the wall 15.

While I have shown and described one practical side of my invention, itis to be emphasized that the specific configuration illustrated isnotintended to limit or restrict my invention beyond the definitions setout in the claims which follow.

Having thus described my invention, I claim: 1. In combination with ascraper side wall having an upright leading edge and a lower edge;

a shoe having an L-shape having an inside corner with two inner edgescomplementary to said leading edge and lower edge of said side wallrespectively;

diagonally directed means on said wall and said shoe 25 adapted tointermesh with one another to thereby locate said complementary edges toone another, said diagonally directed means being projected forwardlyand downwardly relative to the side wall;

and locking means interconnecting said wall and said shoe adapted toprevent motion of said shoe relative to said Wall. a

2. The combination as defined in claim 1 wherein said,

diagonally directed means comprises complementary projections andrecesses formed on adjacent surfaces of said wall and shoe, the exteriorsurfaces thereof being smooth.

3. In combination with a scraper side wall having an upright front edge,a projection extending downwardly and forwardly'from said front edgeadjacent the lower corner thereof and parallel diagonal grooves cutalong its side surfaces adjacent the lower edge thereof in opposedrelation and parallel to the projection;

a shoe having an L-shape complementary to the front lower corner of saidwall adapted to form an extension of the front end and the bottom of thewall;

said shoe being provided with a socket formed through one inner edgethereof, adapted to receive the projection on the front-edge of saidWall;

said shoe further being provided with upstanding diagonal ribsprojecting upwardly and rearwardly of its top surface adapted to seat inthe grooves of said Wall;

and locking means interconnecting said Wall and shoe adapted to preventmotion of said shoe relative to said wall.

4. The combination as defined in claim 3 wherein said locking meanscomprises a pin fitted within coaxial recesses cut through said plateand shoe, the outer ends thereof being flush with the exterior surfacesof the shoe.

References Cited in the file of this patent UNITED STATES PATENTS

1. IN COMBINATION WITH A SCRAPER SIDE WALL HAVING AN UPRIGHT LEADINGEDGE AND A LOWER EDGE; A SHOE HAVING AN L-SHAPE HAVING AN INSIDE CORNERWITH TWO INNER EDGES COMPLEMENTARY TO SAID LEADING EDGE AND LOWER EDGEOF SAID SIDE WALL RESPECTIVELY; DIAGONALLLY DIRECTED MEAND ON SAID WALLAND SAID SHOE ADAPTED TO INTERMESH WITH ONE ANOTHER TO THEREBY LO-